The Niles Audio SAS-1 Combination Speaker-Level A-B Switching System designed to replace manually operated A-B switches. It automatically switches from A to B when a signal is present at its B input. The unit's three switching sections can switch three different kinds of signals: Line-level audio, composite video and speaker level audio. The SAS-1 switches each of these sections at the same time, allowing simultaneous control of these signals if needed. Five-way speaker wire binding posts are provided for the speaker level switching and RCA-type phono jacks are provided for the line-level audio/video switching.

Application Examples:

Automatically switch a pair of speakers between a receiver and a television

Turn a Surround Sound system on automatically

There are two ways to trigger the SAS-1 switch: a signal sensing mode (1) and a voltage control mode (2).

In the signal sensing mode, the SAS-1 automatically switches from A to B when a signal is present at input B. A sensitivity control is provided for setting the amount of input level (trigger threshold) needed to activate the switch. The B input will have priority as long as a signal remains at its input. Depending upon the setting of the delay control, the unit switches from B back to A anywhere between 1/4 of a second to 30 seconds after the trigger signal (input B) is removed. The SAS-1 can be programmed to trigger from the speaker-level, line-level or video sources. At DIP switch is provided for the programming.

In the voltage control mode, applying 5 to 24 volts AC or DC to the control input connector will trigger the SAS-1 to switch. There are several ways this feature can
be used:

An included wall mount, 16Volt AC transformer (Part# XF00008) can be used as the control voltage source. Plugging the AC transformer into the switched AC outlet of an AM/FM receiver will trigger the SAS-1 to switch every time the receiver is turned on.

A toggle switch wired between the output of the AC transformer and the 'Control IN' jack can be used as a manual trigger.

Any voltage source between 5 to 24 Volts AC or DC can be used to activate the SAS-1. For example, a 12Volt control signal from a home automation system can trigger the SAS-1.

A control output connector is also provided. It has four screw terminals and provides two different outputs. Two of the terminals provide a set of normally open, dry relay contacts and the other two provide 12Volt DC output. The set of dry contacts 'close' whenever the switching section of the SAS-1 is activated. They will remain 'closed' as long as the signal that triggered the SAS-1 is present. Depending on the setting of the delay control, they will 'open' anywhere between 1/4 of a second to 30 seconds after the signal that triggered the SAS-1 is removed. With this feature, the SAS-1 can activate television lift systems, operate electric projector screens, control lighting systems, etc.

The 12Volts DC is present at the other two terminals whenever the switching section of the SAS-1 is activated. Depending on the setting of the Delay Control, the voltage turns off anywhere between 1/4 of a second to 30 seconds after the signal that triggered the SAS-1 is removed. This feature is provided as an interface when using the SAS-1 to control other Niles switching devices such as the AVS-2, SPK-1 and AC-3.